Grinding-machine.



B. M. W. HANSON L G. L. GROHMANN.

GRINDINH MACHINE. 4 APPLIOATION r1Ln.1wov.11, 190s.

Patented Aug.15,1911' B. M. W. HANSON 6L 0.1.. GRUHMANN.

GRINDING MACHINE. APPLICATION FILED N0v`11,1909.

Wvtn'esses;

BLMJ W. HANsoN L c. L. GROHMANN.

GRINDING MACHINE.

Patented Aug. 15, 1911.

3 SHEETS-SHEET 3.

APPLIC ATIGN FILED NOV 11,1909

sist-s of a shaft provided with rigid cams, usually made integral therewith, and designated, respectively, by 3, 4, 5,- 6 and 7. So far as the cams 3, 5 and 7 are concerned their contour is the same and this statement applies to the cams 4 and 6. But the number and style of the cams may be very different from those illustrated and t-he work, as will be gathered from what has already been stated, may be of a radically different nature from that shown.

The different parts of the machine may be mounted upon a bed as 10 and in the presenti case one element thereof is a platen as 11 which has a longitudinal` sliding movement on said bed. A platen is al common device in grinding machines so that it is not necessary to go intou detail with respect to the construction andinode of operation thereof it being usual to operate the platen, which carries the work, back and 'forth during the grinding operation so that the grinding wheel can operate laterally upon the work the tool being bodily immovable horizontally although rotative and capable 0f being vertically adjusted. Preferablylassoc'iated with said platen 11 so as to partake' of the longitudinal movements thereof is the attachment or fixture in which the invention is incorporated and this attachment or fixture involves in its make-u Va suitablebase-member as the plate 12 which may be'and as shown is bolted to the platen. There may of course be cases where it would not be necessary to provide the platen or any equivalent reciprocative part.

'The base member or plate 12 constitutes a convenient support for a swinging member which'dircctly carries the work and which during grinding is automatically vibrated preferably by cam and spring mechanisms so as-'to bring accurately successive portions of a cam which is being ground under the action of the, grinding-wheel *hereinafter described, or its equivalent.

The cam mechanism .to which reference has been made comprises one .Qr more cams and each cam, where more than one is present, is an exact counterpart of the. cam being ground by reason of which precision in results are assured. There are two shapes Aofcams on the shaft 2 and it therefore fol.-V

lows that the cams whichy are utilized for eli'ecting the action of the vibratory memberare 'two in number and they and their Iaction will be hereinafter more fully described. A swinging or vibratory member such as satisfactorily answers the requirements is that denoted in a general way by 14. Therefore a movably mounted work support or carrier is provided whiehthough preferably mounted for swinging or pivotal motion need not necessarily be so mounted.

Upon the rear side of the plate 12 there i is shown as rising near one end thereof, the

bearing 15 which supports the stud shaft 15 extending through a rearwardly-extending arm 16 of the swinging member or work-carrier 14 while from the opposite end portionof said plate 12 there rises a bearing member 17 in line with the bearing l5. Said bearing member 17 presents a convenient support for therotary shaft 18 which extends freely through hubs 19 ofr 'the casing 20 constituting a rigid part of the rocking or swinging member 14 and said casing incloses certain gearing and other devices hereinafter described. The driving-shaft 18 and the stud shaft 15 the axes of which are co-incident, present suit-able pivotal support- `ing means for the swinging or rocltinlg member 14. The arm 16 and the casing 20 are connected by an elongated bar 21 and this bar serves conveniently as a support for a tail center block as will hereinafter more particularly appear. The shaft 18 may be 1'0- tated in any desirable manner and as will be obvious it serves a dual function.

' From the base member or plate 12 there is shown as rising a substantially U-sha'ped flange 22 and the pendent portion of the casing 20 (open in the bottom as shown) traverses the exterior of this flange a packing as 23 being. interposed between said pendent portion and the Harige so that a means is provided for effectually excluding flying particles fromthe front'and sides. from entering said casing. Thispacking is shown as'fitted in a groove in the outer surface of said flange 22. The'back of said .100

casing oscillates upon the bearing member 17 and between said back and bearing member a packing 24 may be placed said bearing member in the present ease carrying said packing so that by this construction it-is not possible for foreign substances toI enter said rasing by Way of its open bottom.

A work-spindle is shown'at 25 and as will hereinafter appear this spindle is geared to the shaft., 18. The said spindle is shown supported near its head end by a hub 2G on the inner side of the casing 20. The other side of said casing has a hub 27 complemental to the hub 2G and Within said hub 27 is shown a sleeve-28 which surrounds and turns on said spindle-25 but which is not directly supported by the h'ub 27. In tele'- scoped connection with said sleeve 28 is a second sleeve 28 which is directly supported by and within said hub 27. The sleeve 28 has an endwise movement 'with respect to the shaft or spindle 25 and the companion sleeve 28 the two being connected together by a key as 30. l From this it .will be evident that the-two sleeves can turn as one and that .125

while the sleeve 28 can slide back and forth 'the sleeve 28 has no such movement and themeans whereby this is possible willv hereinafter stated. A disk asv 31 is shown as closing the inneropen end o f thelslidable 'i dexing and shifting means for pattern cams such as will hereinafter be described al- `though it should also be stated that very different means might be employed. to obtain the desired functions and it is conceivable that there might be cases where no such mechanisms need be employed. There is shown as pinned to the outer end of the spindle 25 a disk 32 the hub of which bears against the sleeve 2S While a disk as 33 on the outer end of said sleeve 2S has a bearing against the hub 27 and the two described dcvices prevent :is-will be apparent, slidingr n'ioveinent of the Sleeve 28 on thc spindle or shaft 25. The indexing and cam mechanism has been only brictiy described.; it will loe-described more iu detail hereinafter. The spindle 25 is equipped with a face-plate 34, center 35 and driver dog 36 by which the work can be supported and driven in connection with a second center as 37, the shaftV 2 to which reference has been made beingr iounted between and centered luy-said centers and 37. The center 37 is illustrated as supported by a. block 38 Which has a sliding movement on the bar 21 the usual or some suitable means being provided to effect the movement back and forth' of said block on said bar and the independent adjustment of'said Vcenter 37. The work is therefore .ro-

tated after the method in general 'use in lathesof various types.

The Wheel 39 may be provided for grinding the cams 3 to 7 inclusive and Said Wheel is 'fixed to ay vertically-disposed shaft 40 which is supported byA a standard 41 on the bed 10 of the machine theshaft as usual in grinding machines being longitudinally adjustable. It may be driven by belting as that denoted in a. general way by 42. The faces ofthe cams to bc ground are operatednpoii while the platen is being automatically rein. the nature 4of abridge -connectingtwo ciprocated although it `might be operated by hand. y

There are as will be clear from what has been stated two pattern cams or templets and they are denoted respective1y`by 43 and 4,4 the pattern cam or templet 43 correspondy ing for example inshape with the cams 3, 5 and 7 While the patterncam or former 44 corresponds. in shape with the cams 4 and 6. lhe'pattern cams as will be evident are coaxialwith the spindle 25 and they also turn with' saidispindle. They are preferably integral with ,each other and with `the plate or` disk 31 which constitutes in effect a part of the sleevey being ,rigid` therewith as previouslydescribed` Said pattern cams orform` ers 43. and 44' are alternatelyV coperative with a shoe asy 4.5 which `1n .the present case posts or uprights as 4C) rising from the hase plate 12 and between which the spindle 25 has its combined vibratory and rotative niotions. The shoe 45 is therefore stationary with respect to the swinging member 14. '.lhe cani 44 is in contact With the shoe or bridge piece 45 and it "will beso placed (by the indexing mechanism hereinafter described) as to be in alinemeiu with the cams 4 or t3 said indexing mechanism providing for the angular adjustment of the two pattern cams. For instance. the cams 4 and (i extend exactly oppositely 'from the shaft i2 and it will be evident that the pattern cam 44' must be. adjusted by the index mechanism to agree with such two dispositions. It will be assumed that the pattern cam 44 has been so placed to agree exactly with the disposition of the cam 4. Therefore the pattern cani is initially placed against the relatively .fixed shoe 45 after which the grinding wheel 3E) is brought into contact with the periphery of the cani on the work which is in alineinent with the pattern cani. It will be assumed that the pattern cani 44 hasbeen adjusted to effect the grinding of the cani 4. Said. pattern cam 44 and spring vmechanism hereinafter described or analoythe cams 3, 5 and 7, the pattern cam 43 must be'utilized and said pattern cani 43 will be so adjusted that it will be in precise a1inement longitudinally of the4 machine with the particular cam to be` ground whether it be that numbered 35 5 or 7. It will be apparent that as a cam is being ground the spindle 25 is being turned, and that as the grinding progresses the tool shaft or spindle 40 cairbe advanced step by step automatically or by hand.

The pattern. means operates the swinging member in one directionwhile spring means one advantageous form of which will now be forth operates said lswinging member 14 in the opposite direction to the pal-tern cam means.

There is shown as situated under the base plate 12, a rod 47 thesaid pla-te having on its underside suitable bearings to receive said rod for sliding movement and encirof the spring being constantly to force said rod-to the left in Fig. 4. "Said rod is shown y as having near its opposite extremities and von "theA upper side thereof rack `teeth 50 v.which mesh respectively with pinions 51 ro tative-inbores or chambers `in .theplate' 12.

'cams 43 and 44 may be The teeth of the. pinions mesh with teeth 011 the vertically-movable plnngers 52 slidable in vertical openings in said plate 12. t'y reason of the. described construction the two plungers are forced upward at all times and in absolute unison. Said plungers in the present. case bear at their upper ends against the underside ofthe swinging member' 14- and therefore exert a constant' tendency7 to swing said mein'iber 14 iipwaid which is-resisted by the cams 43 and 44 in alternation` when the spindle or shaftis in motion.

ihe disk 33 hereinbefore described is -iown as being of cup shape and on the rim or flange portion thereof is shown a springplunger 523. It will be obvious that b v turning the disk 3S the angular positions of the adjusted to pnt one of them into exact alineinent longitudinally of the machine of a cam of the shaft Q. which is to' be ground. 'lhe tip or inner end of this plunger 52 is adapted to successively enter seats or perforations' 5S in the rim or flange portion of the clip-like disk 32 which it will be observed fits witliintlie companion disk so that when sai-d plunger is seated th-e two disks are rigidly and lsubstantially coupled together. -'lliere are usually four holes although their number inavvary.

Extending vertically of the casing and supported rotatively by the top thereof. is a short shaft 54 to the lower end of, which is fastened an arm 55 provided with a pendent stud or pin ."it' to enter an opening or seat in the slidable sleeve QS and it therefore follows that' by swinging the arm 55 tliecauis 43 and 44 can lieln'ought alternately under the bridge-loi' shoe 45 to 'iut said eanis alterh 1 Said shaft 54 is shown nately into action. provided at its upper end with-a maiinallyoperable ai'iii 57 by wl-iieh the lower arm 435 can be swung to secure the alternate eo-' operation of said cams 43 and -l-Jf with the liridge or shoe 4."i said arm 57 being provided with a latch 5S to alternately engage pi'oi'ierly positioned openings in the top of the casing 20 to thereby rigidly maintain the sleeve Q8 in its two lshifted positions.

The forward wall of tliecasiiig supports for rocking movement a short shaft :35i provided atl its outer end with a handle or crank-arm t3() by which said shaft can be easily turned. at its inner enlgl with an eccentric stud or pin (11 `which bears against' a ..sli'ouldei.' t'ilon the base-plate 12 and which nia'ylie formed on the forwa rd upright 46. Uy turning said' shaft. 59 the rocking frame I4 can be. swung down'to permittliat. cam (43 oi' t4) which sleeve 28.

is 'not in action, to clear the bridge oi' shoe 45 on the movement To the shaft or spindle. 25 there is shown fastened a' spur-gear 63 in mesh with a pinion 64 tli shaft 65 of which is rotatively 'llie saidshaft is provided" longitudinally of thel supported by the opposite side, walls of the casing 20. The pinion 64 is fastened to said shaft 65 and to the latter is fastened a. spurgear 66 in mesh with the pinion G7 on the main or driving shaft 18 by reason of which when the shaft 18 is in motion the workspindle or shaft 25 can be also driven and will be kept in motion irrespective of the different angulary posit-ions of the swinging member or work-carrier 14.

7c have described rather .in detail one form of embodiment of the invention so that as hereinbefore intimated, those skilled in the art can properly practice the invention. lhe machine maybe radically changed as our invention does not reside in any particular means or mechanism but rather 1n certain broad relations as will appear in our claims. Te have initially made a brief reference to the more prominent features .of the invention and hereinafter will refer to these more in detail. l l

` From the statements already made it; will be. apparent that we provide means' for moving the work through a definite or predetermined path and that we reduce the peripheryY (which in the present case is irregular) o the wor r by a device the form of the active or cutting face of which remains unalteredy or unchanged by wear- 7e have found that we can with advantage employ a grinding-wheel such as 39 .the act-ive face of which isflat and which is also preferably.

the shape of the cam or work to be ground norueed the two part-she equal in size.v By tlie'constriiction described as the carrier 14 lis oseillated during which motion the pattern cani is turning against the Hat guide face of a eont'rolliiig memberas the bridge l5.' every partof the work'is brought into this grinding plane. and the effectis as though the irregular surface to be ground of the work was rolled along a. fiat-'surface and owing to the fact that; the active. face of the reducing member is parallel with thisl means including aI plane or assnmed'surfaee it follows that the form of the eainto be ground will never vary .so Jong as the movement of the work to be ground remains constant or definite.

lt will be assumed that th'e Work` is being movedthrough .the desired path bythe mechanism described and that the periphe-l ral portion of the diskcperaties upon the irregular surface'to' be ground. At the outset the form of the Work would be as desired but. when the said wheel is adjusted to take up wear the ieriphery ofthe adjusted wheel will bear a iiiierent relation to the periphery of the work so that the form of the latttr will be changed, owing to the tact that the form of the wheel has changed. That is to say the reduction in size of the wheel causes a difference in radius thereof; the convexity of the peripherally-worn wheel will not be the same as it was originally. In the ease of a wheel such as We employV the Shape of the active or cutting portion thereof never varies notwithstanding the fact that'said active face may be worn away by use.

It will be evident from the observations already made that we provide means for holding irregular work and a reducing de4 vice for the irregular surface of the work, and that We associate therewvith means for causing a relative motion of the work and reducing device Vand for also causing said reducing device to operate upon all parts of said surface and at the same timemaintain a fixed or definite relation between said surface parts andthe active face et' the reducing member irrespective of Wear of said face.

lVhat We claim is:

1. A grinding n'iachine con'iprising a vibratory member provided with a rotary work-sul'iperting .spindle7 a pattern device carried by and rotativewith said spindle, a relatively {ixed part against which said. pattern device turns, and a 'fiat-faced grinding wheel to actupon the peripheral portion ot' the work. i

il. A grinding machine comlnrising a vibrator- V member provided with means for rotatively supporting the work, a pair of pattern devices coaxial with the work, means for" putting said pattern devices al ternately into action, and a grinding Wheel to operate upon the Wbrk.

3. A grinding machine comprising Aa vibratory member provided with means for rotatively supporting the Work, a pattern cam operative against said carrier7 and a pair of simultaneously-0perative, springactuated devices for acting against the said vibratory member in opposition to said pattern device.

4L. A grinding machine comprising a vibratory member provided with means for rotatively supporting the Work, a grinding Wheel to 'act against the work, a pair of plungers acting against said vibratory member= a spring-operated rod, and means for transferring the eli'eet of said rod to both said plungers.

A grinding machine comprising a vibratory member provided with means for rotatively supporting the work, a pair of pattern devices rigid with each other and rotative about the same axis as the work, and arelatively lixed part against which the pattern devices are adapted to operate said pattern devices being shiftable to put the same alternately into engagement with said relatively fixed part. I

' G. A grinding machine comprising a work carrying member provided with a rotary work supporting spindle, and a grinding tool, one of said parte being mounted for n'iovemei'it in the direction of the axis of motion of the `Work to laterally reduce the latter7 and mechanism including a pat-tern, for imparting movement to said work carry ing member to bring different circumferential portions of the workthereof under the action of said grinding tool.

In testin'iony whereof we aflix our signatures in presence of two Witnesses.

HEATH SUTIIERLAND. 

